hexagon: switch to generic clone()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/hexagon/include/uapi/asm/unistd.h

@@ -28,5 +28,6 @@
 
 #define sys_mmap2 sys_mmap_pgoff
 #define __ARCH_WANT_SYS_EXECVE
+#define __ARCH_WANT_SYS_CLONE
 
 #include <asm-generic/unistd.h>

arch/hexagon/kernel/Makefile

@@ -3,8 +3,7 @@ extra-y := head.o vmlinux.lds
 obj-$(CONFIG_SMP) += smp.o topology.o
 
 obj-y += setup.o irq_cpu.o traps.o syscalltab.o signal.o time.o
-obj-y += process.o syscall.o trampoline.o reset.o ptrace.o
-obj-y += vdso.o
+obj-y += process.o trampoline.o reset.o ptrace.o vdso.o
 
 obj-$(CONFIG_KGDB)    += kgdb.o
 obj-$(CONFIG_MODULES) += module.o hexagon_ksyms.o

arch/hexagon/kernel/process.c

@@ -88,7 +88,7 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
  */
 int copy_thread(unsigned long clone_flags, unsigned long usp,
 		unsigned long arg, struct task_struct *p,
-		struct pt_regs *regs)
+		struct pt_regs *unused)
 {
 	struct thread_info *ti = task_thread_info(p);
 	struct hexagon_switch_stack *ss;
@@ -117,10 +117,11 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 		pt_set_kmode(childregs);
 		return 0;
 	}
-	memcpy(childregs, regs, sizeof(*childregs));
+	memcpy(childregs, current_pt_regs(), sizeof(*childregs));
 	ss->r2524 = 0;
 
-	pt_set_rte_sp(childregs, usp);
+	if (usp)
+		pt_set_rte_sp(childregs, usp);
 
 	/* Child sees zero return value */
 	childregs->r00 = 0;

arch/hexagon/kernel/syscall.c

-/*
- * Hexagon system calls
- *
- * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 and
- * only version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- */
-
-#include <linux/file.h>
-#include <linux/fs.h>
-#include <linux/linkage.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/syscalls.h>
-#include <linux/unistd.h>
-#include <asm/mman.h>
-#include <asm/registers.h>
-
-/*
- * System calls with architecture-specific wrappers.
- * See signal.c for signal-related system call wrappers.
- */
-
-asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
-			 unsigned long parent_tidp, unsigned long child_tidp)
-{
-	struct pt_regs *pregs = current_pt_regs();
-
-	if (!newsp)
-		newsp = pregs->SP;
-	return do_fork(clone_flags, newsp, pregs, 0, (int __user *)parent_tidp,
-		       (int __user *)child_tidp);
-}